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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8a4dde132584723e311ceb4f8adbf7e7a48712d90af94c84a38ae72db89ecd' 
  AND token = '6s0PlhmuJLTYTpLWGkrL2chj3Js0S4KU2QkfriJ0R5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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