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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f98ae54240c5f97090a4243186da7c3de118438f682588f883729f4d515fb4' 
  AND token = 'bhN4txgDS/LWRRPP+XfjCwFCxWdHpPMxv7AiamDCme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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