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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9411077d91fb1cc8701dd94f475e3d5a16341091f2be387acce83a53b5f4de8e' 
  AND token = 'WyVUCx1q5HCr/8rbaQc4uPNgyCdNSJiDHJrYobsuGcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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