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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60c76c72052cb91018a624bbf2bca846b674c97cb5d8b820a1ca9cf900cefcd' 
  AND token = '8c8bA1rbXd8i8oaiETl0v8rAqkWvMg7RmXtVLTnMpcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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