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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac530cd0754cf9d71a227918c2479f5fe727552e13fddd7e2d26a007643bc37e' 
  AND token = 'IWNfA1Z+8fLzx+r2/akzoNDuXyY39iluNpE0S0XJFGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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