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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7c3e35a3e716e944134ade12fd1bf5cdeb151da5b1bfb92d9ce12e86f099a8' 
  AND token = 'aZcnoRu1f8Yto9fcjkifo1UJb/qEU1LnqZ3mfM/LwWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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