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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db653990a3377ac98ec295ad20fb2d53704a55a2860c7c718ce908cafc22b8c1' 
  AND token = 'dXxbcHp9lykPA30lT7qik2HY0ROM/PSRtLk+h1rr14M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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