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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849bd8d8c23eed4ad4f3240a9d610b1b3d535ee49cada468058327e5ece83b81' 
  AND token = 'eqha9/jfL2A/0jFGgicAKzl3BC9AkEWCmF16rqMT0Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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