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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a793c8b93da6f5e8159491ec5f2c1829f2e2d37d5a6d1e25e2ad11c0f28409' 
  AND token = '/bBuU171GtPFcWiB2xVpCtmZNHnV6N5kLG2HfZrWAIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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