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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c55c6cf4f6bcef1a2d92e6d59e28c602e72dd9693cacc837dc9625415453f17' 
  AND token = 'Q4nYGMqNH3ofC0s4LJxUg9tWUPl2hS1GAQP2HdhmKig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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