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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9111c1b0f98b4fdaadbe8e2a93b41cc30d2337fd4d5c4be76a9b2a4d6008d4' 
  AND token = '+xutyqkAJedW7l0GibdzlnytRG3SNhjk/poFeyBF3+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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