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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b4998bc45b8774c1c4b70b6a6ef264e692256ba6576101d82d6ea45647f158' 
  AND token = '8eUcctmdGC3746WnGw/9lU9HzmVqALsgM+k+Z97W+zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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