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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61703dbbb742e986bd58f3a02c17955a25d360d1e86fb6a37875101c88840744' 
  AND token = 'U44/5C0D0m4jumrebI1fZPIOMtmmRzKd08BS0NBp8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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