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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f1d11afcbd0f30677cfadb0ad9ec8171681eea5331920ea447189b020d034b' 
  AND token = 'YJOSpoUnVhK13NiajUboF4eKbGpHi6mU303FBF/h4d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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