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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93e038a8a3fd4a5a00b3e39bbfa31561216a704d7384e4f30d3f206a066dd7d' 
  AND token = 'vtJ/j/wpU0TuqceRknpHyujj9U/kICJwMqkmpg1ZX5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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