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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfab679eb6ba4181ae2b5f224eb664ddf2475996cb39c6f9a2b51adf0f7a24a' 
  AND token = '1z0E1hY4jpPXkWleC1Abm3Q5F+K8960RjkfK5lVR74A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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