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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1d044ce0aa2e4e6f45ab004e684ea45c259f3b1660048b0edb7f88415fac50' 
  AND token = 'qezwVEyfTz/L3gCSK3b1S60BhMHPlbK0mxC9Ex7jcbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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