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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5535adf2d27f6a3faa96879c6ca8c917ef6e2bee444339e54f4d57a97cbd961b' 
  AND token = 'SmslGzsNjdaKnGhSMptmrnXF5SB2thlge64OXBr177o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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