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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920fec50fceb60e7bcb785f98bd4a90f6b4c181ac8e09c5d2b33691f8c2e2463' 
  AND token = 'Ze6LQyAsw9DX4LeQjWgXoNZ1emHGeyYNqgcW7DYQoYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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