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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96ef107949bce9c75741b0c4234d27b5e6e44f3560a705ac560444e6d3c2ef2' 
  AND token = 's1/Ae80N6jSiHjyPY4nc8A4hiX57hwJfLPMS9wuUCic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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