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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201da258dc47baa8966efb9b45bc0b37db672cc79d7b42171d5f32368bc44608' 
  AND token = 'cWOXJ3sA1lJnLK6yeP6y5hBl3lRRHKWR1fhqPUaxwS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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