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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d842dfbac067b7bf450bcb5a3ee4f3e31321fd34faf5d374283a6f7a94eb6c6' 
  AND token = '/X9Fbq4fGPTSOxql6l0M1a1WL1PMCqQLEJgeMH5Vhes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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