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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96c88591349b775f9c550202d8eecbae6d8f7d72f5e8a69d9c07be18152545e' 
  AND token = 'ioFHAVOlnfmka7H9TD7XVouUB53UTOE97sP7CKUvA80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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