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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de2918805a235003b2a0a58ee5de40f9bbe9ea2277139b38b4ef0a3f1f1b651' 
  AND token = 'SpuaMnZSL2H8b3cT3RsakP5RzLhzS7lM28+glkUzmZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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