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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cd74be3d59a67d436e582ced5f4a09d51ad6fca14dfa3ebffc02ce293a1da8' 
  AND token = 'DN8HUnXzUzabPlI1Qa9hUeM/KMQV4O4mNWeh02Gd1Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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