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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193bd5f09b819faf16b4a61240364c622b4f6507f9d61957faa353e9105511f5' 
  AND token = 'dmtJ6odmElaEarjggIqme4yy0kAqvu6AzqMoWloEOmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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