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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebef1fe1f0a10de2bc7c34d4545d6606500362ab800e8cfe16ec6360fde7c3b2' 
  AND token = 'q/1ox7zIVwNc4oj5ZkgGhZv/+QcoS5b1Z9GlX4wGkc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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