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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f2e395e86def1ae4353d821767f9d9264805f67c69f8148fddb911847d9efa' 
  AND token = 'vzx8ngBz7vWxgcVfVitUrUiAIsHB2EA3IlMIYaAZDmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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