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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdd2857ad4834dced7a448b99784f09a8c8001d1df80637f6e8222b515aab2c' 
  AND token = 'h9UpBOjTgL9akj4ng2g5OCgciwpB1yyofpqPfWBGBek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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