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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b4ce9c385f28d08592839c3093587997f49b5ff153140f6d02d4b757eb231e' 
  AND token = 'dnpnXBosYvkVVl3cE+yeVMu41JPN7BqUr6fL0u+JY2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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