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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336acc71b2d39dfd78a3471bb95c4f11606e2f591749070130d72274a99fc0db' 
  AND token = 'Vinky8fxvLMPpqBySBFZr05lx6QWtd+Iu9vMw3xtH8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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