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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c930a217d36d34ebcd677e0999936647a7173f27876da9da2a9880da626ddafa' 
  AND token = 'Y0Lr1+6XQxLbATIzmNaSvEWOVEy3X8oZPSY7xFjO38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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