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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2879c55f7f6b6d1a1af3817f3ba200df9efbd1f9662e3cf72ec1789dea7c71f5' 
  AND token = '3wETZFWvKiHbUpfdeVWZpFaH4BZu0erTsBgHvvfMuDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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