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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba461bf7dfb05bece7daf56c18a0278b58c16ed5a8d5f30d77a718c1664e104' 
  AND token = 'EWcb43hJOqaNMWvrGDE015VjCj9RnVFjIsiluA3zHmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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