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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bcfa997d8038a3e63d3215e2907a127903f56f597fe9b082e3e069b4214c8d' 
  AND token = 'Z8KxwSI6mWBgLJjsxo2UPIpXswnTke7eLrdZ2YeK8Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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