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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c93a3307c5fcb866dc9bb41240801bd6c96e9b8ba52b2649eb0db714de26c8' 
  AND token = '2YcFe/N0jSg18n8pGi9qhCiXNGSL3jGKsrND2mFlfKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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