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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac9d34fa2d33802c3a783272d3f80b4656a0d7bd2108d9efd6267e186afbedf' 
  AND token = '/87xdR/D4CpBWnXfajDxDFEPdzWuRKuK4I4ubMUimF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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