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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a6c60d31d0cd2c1699cfdd7f6e8c7115ebea20e84d19450a86faac982f5e85' 
  AND token = 'HAlkROtslOuR/BdYUuZowgFOf+wzc96tta0DdUYq+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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