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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f71cb8bde1c2a35103273d23a3c590875ce223fed540289782c14836d0d811' 
  AND token = 'evSXXLJhf2HdaFWTwv+Rjh/tI1AIoWQ5NVz8O4wpioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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