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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0d44ed93a84bd19d0a0f9dcf99a47c4a38d8ad27470a7f63090e2ed4464427' 
  AND token = 'dIDs5W9C8L6f8LxATcfLjrFe5RYXL7Kx2rv5tF/yWxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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