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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987ab9c87dd90e92999141ce59ff98c6c9cfdbc2802e599f701e5065b222430d' 
  AND token = 'NVAXGJz+gT5ZPuNTjga0PSxwUGWK60Qe3n1IL8uyx8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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