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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cf68396100560478ba468a64c7bca25c45d12a6729f16f0fde7857b9280f5e' 
  AND token = 'fMvqHv2fGblhFGiOlNBT4DUJ4JMoVRnOqqWGtKGetCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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