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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ec06bd7464629720e3c780213b3e2a4193e1be1ba9d02c58456dcf3a93e61d' 
  AND token = 'SphjobYKJDYV5mpDn+9O5sJenB1tByqiTwLzXaNMIEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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