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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204ec0db62c8fd4a358fcc58c62b3c2c82ca7832514d3651ed3c3c4b3175d025' 
  AND token = 'Iz99p2k4Sd2guEm4jYvQd/9zYE1xhWThTGwkxAkkUyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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