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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ee5307a27828cf4ce7696e2ded7f2ce1d6cf1c4f957b62108b073cb9dbbc7' 
  AND token = 'zmz+KDwDpAT2s2xtbWtCk7CjbubciJh8SPheRKKyHls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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