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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e536dfad167e72d5dd4b1233e5f71d8cf3cfed10ac810123c5bfd4e837add8' 
  AND token = 'r9V5WWfsZv33B8Tblmm8DYZpKXZLD2NbXNCAJJh9CCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}