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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56529e669fed5dae43ec4c1f958ebe2feb89e4f48619ff50fdefcc832461d60' 
  AND token = 'BZvDdNFStH7n8eQTZn4Ju6SNfj/zj3gQBtWGapPdqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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