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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3423e852fe02c77a65d75d3e1640d2bbbe6a97eda3fddbbaa576949f8949f3ae' 
  AND token = '3atbNLyn6Estj8GcuJuvXua0vPiXja8KzkzKUCGNT7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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