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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef3a199b0144cac6d2a778485ab825b7af1ff5626ff08fce47600ed5e2b4122' 
  AND token = '50fyGCQs6j3+7v4mJjPrIXpfSyjZjh4a3z3diHoVhcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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