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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2036fd1d778739d2af2741a2dd0ec2815f0c89ae6305862f3426072390170c' 
  AND token = 'Ack8a9dmmHhf+aAc0B3Uo03xDX3HdvH2oXaCkh98QPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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